I do not understand your question..

There are five different titan-kernels stock/lv/ulv/xlv and ideal. You need to download a different kernel depending what type of voltage you want.

The mhz or "overclocking" is decided in the /etc/pmconfig. However you could try a mhz before you decide which speed to settle with. With the command i wrote in my last post. And yes, the ideal-kernel should be runing with 500 as min_freq.